ANODE
Hydrogen in
H₂ → H⁺ + e⁻
H₂ → H⁺ + e⁻
PEM
Protons cross
Electrons blocked
Electrons blocked
CATHODE
Oxygen in
H⁺ + e⁻ + O₂
H⁺ + e⁻ + O₂
OUTPUT
Water
+ heat
+ heat